package top.saiyin.list;

import java.util.Arrays;

/**
 * @Program: leetcode
 * @Description: 加一
 * @Author: sy
 * @Create: 2020-08-26
 **/
public class PlusOne {

    public static void main(String[] args) {
        int[] digits = {9, 9, 9, 9};
        System.out.println(Arrays.toString(plusOne(digits)));
    }

    public static int[] plusOne(int[] digits) {
        for (int i = digits.length - 1; i >= 0; i--) {
            digits[i]++;
            digits[i] = digits[i] % 10;
            if (digits[i] != 0) {
                return digits;
            }
        }
        digits = new int[digits.length + 1];
        digits[0] = 1;
        return digits;
    }
}
